This has been beaten to death (do a search). Many users who have multiple players have reported that there is no discernable difference between bitstream audio to their AVR vs. using the PS3 to decode the audio and transmit it as PCM. There are a few (small but vocal minority) members who insist that bitstream sounds better.
If you really want bitstream for whatever reason, your best bet would simply be to buy a player that supports this feature.
Keep in mind that the folks at Criterion are using a PS3 as their BD player. If PCM from the PS3 is good enough for them, it's sure as hell good enough for me with my <$100K audio set up.